Page 5
P.I.P.–BP1X & P.I.P.–BP1C
Reference Manual
2 Controls,Connectors
& Setup
A/B. Connectors
Balanced 3-pin XLR or quick-discon-
nect removable barrier block connec-
tors are provided for the inputs and
outputs. The
P.I.P.-BP1X is supplied
with XLR Jacks: a female XLR for the
input connector and a male XLR for
the daisy chain output. These connec-
tors are wired for pin 2 = Hot. The
P.I.P.-BP1C is supplied with quick-dis-
connect removable barrier block con-
nectors; mating connectors are
supplied to allow the user to quickly
disconnect an input or output and
move it to the other channel. These
connectors are wired pin1=Hot. (See
Section 3 for input and output wiring
examples.)
C. Low-Pass Filter DIP Switches
The input signal is processed first by a
4th-order (24-dB/octave) low-pass
filter network with a Butterworth re-
sponse characteristic. Four eight-seg-
ment DIP switches (S100,S101,S102
and S103 for channel 1),(S200,S201,
S202 and S203 for channel 2) select
the low-pass filter frequency at which
the output is –3-dB down from the in-
put. (See Figure 2.2 for a complete
table of frequencies and settings and
Figure 2.3 for sample frequency-re-
sponse graphs.) Note that all four DIP
switches must use the same settings
for the response to be correct. These
DIP switches are factory-set to 20 kHz.
D. High-Pass Filter DIP
Switches
The signal is processed next by a 4th-
order (24-dB/octave) high-pass filter
network with a Butterworth response
characteristic. Four eight-segment DIP
switches(S104,S105,S106 and S107
for Channel 1), (S204,S205,S206 and
S207 for Channel 2) select the high
pass filter frequency at which the out-
put is –3-dB down from the input. (See
Figure 2.2 for a complete table of fre-
quencies and settings and Figure 2.4
for sample frequency-response
graphs.) Note that all four DIP switches
must use the same settings for the re-
sponse to be correct. These DIP
switches are factory-set to 23 Hz.
E. Low-Frequency Equalization
DIP Switches
Following the high-pass filter is a 6th-
order loudspeaker equalization fea-
ture. A ten-segment DIP switch (S108
for Channel 1); (S208 for Channel 2)
sets the +6 dB boost frequency of the
vented-box equalization filter. Note:
(Switch 7 is not active and can be set
to either the“ON”or“OFF’) position. This
feature is used for loudspeakers that
have been designed as a 6th-order
system and require 2nd-order equal-
ization to achieve optimum perfor-
mance. The filter uses the Sallen-Key
non-inverting second-order high-pass
topology. The loudspeaker manufac-
turer determines the frequency to
which this filter should be set. Low-Fre-
quency Equalizaion is factory-set to
Flat (Figure 2.5 shows a complete list-
ing of equalization points and the cor-
responding switch positions; Figure
2.6 shows typical response curves for
the filter).
F. Constant-Directivity Horn
Equalization DIP Switches
This ten-segment DIP Switch (S109 for
Channel 1) ); (S209 for Channel 2) sets
both the +3-dB shelving frequency
and the –3-dB low-pass roll-off fre-
quency of the constant-directivity horn
equalization filter. Constant-directivity
horns have an inherent roll-off in their